Fixed start date for libstdc++ range support

Author: rollbear

include/strong_type/range.hpp

@@ -39,7 +39,7 @@ namespace internal {
 struct not_an_iterator {};
 
 
-#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230601L))
+#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230528L))
 template <typename T>
 auto begin_type(T* t) -> decltype(std::ranges::begin(*t));
 #else
@@ -49,7 +49,7 @@ auto begin_type(T* t) -> decltype(t->begin());
 
 auto begin_type(...) -> not_an_iterator;
 
-#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230601L))
+#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230528L))
 template <typename T>
 auto const_begin_type(const T* t) -> decltype(std::ranges::begin(*t));
 #else
@@ -58,7 +58,7 @@ auto const_begin_type(const T* t) -> decltype(t->begin());
 #endif
 auto const_begin_type(...) -> not_an_iterator;
 
-#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230601L))
+#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230528L))
 template <typename T>
 auto end_type(T* t) -> decltype(std::ranges::end(*t));
 #else
@@ -67,26 +67,26 @@ auto end_type(T* t) -> decltype(t->end());
 #endif
 auto end_type(...) -> not_an_iterator;
 
-#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230601L))
+#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230528L))
 template <typename T>
 auto const_end_type(const T* t) -> decltype(std::ranges::end(*t));
 #else
 template <typename T>
-auto const_end_type(T* t) -> decltype(t->end());
+auto const_end_type(const T* t) -> decltype(t->end());
 #endif
 
 auto const_end_type(...) -> not_an_iterator;
 
-#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230601L))
+#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230528L))
 template <typename T>
 auto cbegin_type(const T* t) -> decltype(std::ranges::cbegin(*t));
 #else
 template <typename T>
-auto cbegin_type(T* t) -> decltype(t->cbegin());
+auto cbegin_type(const T* t) -> decltype(t->cbegin());
 #endif
 auto cbegin_type(...) -> not_an_iterator;
 
-#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230601L))
+#if defined(STRONG_TYPE_HAS_RANGES) && (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20230528L))
 template <typename T>
 auto cend_type(const T* t) -> decltype(std::ranges::cend(*t));
 #else